This Linear Stage by Melles Griot have a very smooth motion while having good load capacity. It has Lockable Positioning for increased repeatability and precision. The aperture is 2", and the hole taps are 1/4-20. Travels on X-Axis only, and does not include a micrometer.
6in x 5 3/4in
approx. 1/ 1/2in
Melles Griot X-Axis Linear Stage w/ 2" Aperture (Micrometer Not Included)